And the angel said to him, "Gird yourself and put on your sandals."

Acts 12:8

dress code?

Is there one?
No way, Jose!  Come as you are.

What should I wear?

Wear whatever you normally wear. Wear what you like to wear. You might see a little business attire, but most people, including staff, will be dressed comfortably and casually. And we mean casually.